| 摘要 |
To solve the conventional problem in a disk drive unit that frequent interruptions be produced in a processor each time a head transits on a servo gate. To cope with the above-mentioned problem, a head drive unit 17 performs an off-track check using servo information read by the head 2 whenever the head 2 transits on each servo gate. Thus, an interruption processing required by the processor 16 is limited to the cases of either an operation completion interruption which is produced when a read/write operation is completed normally, or an error interruption which is produced on occurrence of the off-track or read error. This enables to reduce the number of interruption processing times performed in the processor 16 , which results in reducing the load of the processor 16.
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